A DNS zone for this domain already exists on NS1 ERROR

Hello There!
I’ve just bought my domain on name.com and its default nameservers are n1.name.com to n4.name.com. when I try editing them and adding netlify nameservers via the wizard, I get the error:

It appears this domain is already managed by our DNS provider, perhaps via another service. You can manage your domain via the external service that also uses NS1 as DNS provider, or [contact support for help.
Also after adding this devarshigoswami.codes A on nameservers DNS records the changes take effect on netlify primary domain… And I cannot configure CNAME record because it gives me an invalid error when I try configuring it,

hi there,

could you try reading through this guide and seeing if this advice is helpful at all?